x = int(input())

if 30 <= x:
    print('Yes')
else:
    print('No') x = int(input()) x int(input()) int input() input if 30 <= x:
    print('Yes')
else:
    print('No') 30 <= x 30 x print('Yes') print 'Yes' print('No') print 'No' x = int(input()) int(input()) x
x = int(input())

if 30 <= x:
    print('Yes')
else:
    print('No')